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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99223e92a57570967407684822916280d8720e6bba54ff9d562ca6a986733b6f' 
  AND token = '7IGyyOu/7C7nM5UNlPxj5lXW+XsqOhFnq28076bujfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}